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WITH PostTagCombinations AS (
    SELECT 
        pt.PostId,
        STRING_AGG(t.TagName, ',') WITHIN GROUP (ORDER BY t.TagName) AS TagCombination
    FROM PostTags pt,
         Tags t
    WHERE pt.TagId = t.Id
    GROUP BY pt.PostId
),
CombinationCounts AS (
    SELECT 
        TagCombination,
        COUNT(*) AS CombinationCount
    FROM PostTagCombinations
    GROUP BY TagCombination
)
SELECT TOP 5
    TagCombination
FROM CombinationCounts
ORDER BY CombinationCount DESC;

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edited nov 8

created nov 8 Janis123